get the latest 8 records laravel 5.1

How can i get the latest 8 votes on this query by mobile number field:

results = DB::table('votes')->whereIn('votes.id', function($query){
                    $query->select(DB::raw('MAX(id) as id'))
                    ->from('votes')
                    ->groupBy('mobile_number', 'position_id','code');
                })->where(array('code'=>$code,'position_id'=>$positionId))->get();

on this query it gets the latest total votes of the users but not limited to 8.

->where(array('code'=>$code,'position_id'=>$positionId))->take(8)->get(); //it seems this is not working

Any idea? Thanks

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